[BUG] CameraView crashes Android application when going Back too soon

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Did you read the "Reporting a bug" section on Contributing file?

- [x] I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

### Current Behavior

Hello,
I am facing an issue with the `CameraView ` when capturing an image and the user hits the `Back` button before the callback was handled.
This results in the following exception.
```
**System.NotSupportedException:** 'Unable to activate instance of type CommunityToolkit.Maui.Core.CameraManager+ImageCallBack from native handle 0x79636e2bf8 (key_handle 0x2b0bc91).'
```

If the capture event was handled the `Back` button will not crash the application.

### Expected Behavior

The application should not crash when the exception is thrown.

### Steps To Reproduce

1. Open the `CommunityToolkit.Maui.Sample.sln` solution
2. Start the `CommunityToolkit.Maui.Sample` application on an Android phone.
3. Navigate to `Views`
4. Select the `CameraView Page`
5. Hit the `Capture Image` button and immediately hit the `Back` button in the toolbar.

### Link to public reproduction project repository

https://github.com/CommunityToolkit/Maui/tree/49a124115c6bc09d9ca1ddcdbcc8b425c8ff7479/samples

### Environment

```markdown
- .NET MAUI CommunityToolkit:12.2.0
- OS: Android
- .NET MAUI: 9.x
```

### Anything else?

_No response_

Reproduce the crash from the CommunityToolkit.Maui.Sample.sln on an Android phone by opening the CameraView Page, capturing an image, and immediately using Back. Then inspect the CameraView and CameraManager+ImageCallBack path; done means leaving the page immediately after capture no longer crashes while the capture callback is still pending.

Written by the indexing model from the issue text.